通过手机 USB 和外接设备通讯;

package com.shanwan.usbdevice;

import android.annotation.SuppressLint;
import android.app.PendingIntent;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.hardware.usb.UsbConstants;
import android.hardware.usb.UsbDevice;
import android.hardware.usb.UsbDeviceConnection;
import android.hardware.usb.UsbEndpoint;
import android.hardware.usb.UsbInterface;
import android.hardware.usb.UsbManager;
import android.os.Binder;
import android.os.IBinder;
import android.widget.Toast;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

public class USBIoService extends Service {
    private static final String ACTION_USB_PERMISSION = "com.android.example.USB_PERMISSION";
    private MyBinder myBinder;
    private PendingIntent mPermissionIntent;
    private UsbManager mUsbManager;
    private UsbDevice mDevice;
    private final ArrayList<UsbDeviceConnection> mUsbDeviceConnectionList = new ArrayList<>();
    private final ArrayList<UsbInterface> mUsbInterfaceList = new ArrayList<>();
    private Thread mIOThread;
    private volatile StringBuilder stringBuilder = new StringBuilder();


    private final BroadcastReceiver mUsbReceiver = new BroadcastReceiver() {
        public void onReceive(Context context, Intent intent) {
            String action = intent.getAction();
            MyLog.e("action:" + action);
            if (ACTION_USB_PERMISSION.equals(action)) {
                synchronized (this) {
                    UsbDevice device = (UsbDevice) intent.getParcelableExtra(UsbManager.EXTRA_DEVICE);
                    if (intent.getBooleanExtra(UsbManager.EXTRA_PERMISSION_GRANTED, false)) {
                        if (device != null) {
                            if (mIOThread != null) {
                                mIOThread = null;
                            }
                            mDevice = device;
                            initConnection();
                        }
                    } else {
                        showToast(getString(R.string.usb_device_connect_error1));
                    }
                }
            } else if (UsbManager.ACTION_USB_DEVICE_DETACHED.equals(action)) {
                releaseConnection();
            } else if (UsbManager.ACTION_USB_DEVICE_ATTACHED.equals(action)) {
                connectDevice();
            }
        }
    };

    public USBIoService() {
        initVariable();
    }

    @Override
    public IBinder onBind(Intent intent) {
        // TODO: Return the communication channel to the service.
        MyLog.d("call OnBind");
        initBroadcastReceiver();
        initUsbManager();
        return myBinder;
    }

    @Override
    public void onCreate() {
        super.onCreate();
    }

    private void initVariable() {
        myBinder = new MyBinder();
    }

    @SuppressLint("UnspecifiedImmutableFlag")
    private void initBroadcastReceiver() {
        mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), 0);
        IntentFilter filter = new IntentFilter();
        filter.addAction(ACTION_USB_PERMISSION);
        filter.addAction(UsbManager.ACTION_USB_DEVICE_DETACHED);
        filter.addAction(UsbManager.ACTION_USB_DEVICE_ATTACHED);
        registerReceiver(mUsbReceiver, filter);
    }

    private void initUsbManager() {
        mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
    }

    private void initConnection() {
        try {
            MyLog.e("getInterfaceCount:" + mDevice.getInterfaceCount());
            showToast(getString(R.string.usb_device_connect_interface) + mDevice.getInterfaceCount());
            for (int i = 0; i < mDevice.getInterfaceCount(); i++) {
                UsbInterface mUsbInterface = mDevice.getInterface(i);
                UsbDeviceConnection mUsbDeviceConnection = mUsbManager.openDevice(mDevice);
                boolean connectionState = mUsbDeviceConnection.claimInterface(mUsbInterface, false);
                if (connectionState) {
                    mUsbDeviceConnectionList.add(mUsbDeviceConnection);
                    mUsbInterfaceList.add(mUsbInterface);
                }
                stringBuilder.append("usb接口：").append(i).append("//").append(mDevice.getInterfaceCount()).append(" 已连接:").append(connectionState).append("\n");
                for (int index = 0; index < mUsbInterface.getEndpointCount(); index++) {
                    UsbEndpoint point = mUsbInterface.getEndpoint(index);
//                    MyLog.e(" i:" + i + " :" + connectionState + " j:" + index + ":" + point.toString() + " type:" + point.getType() + " :" + point.getDirection());
         //判断UsbEndpoint的类型，也即是type。这种类型的UsbDevice使用USB_ENDPOINT_XFER_BULK这种类型的UsbEndpoint进行通信。
                    if (point.getType() == UsbConstants.USB_ENDPOINT_XFER_BULK) {
                        if (point.getDirection() == UsbConstants.USB_DIR_IN) {
                            stringBuilder.append("BULK USB_DIR_IN index:").append(index);
                        } else if (point.getDirection() == UsbConstants.USB_DIR_OUT) {
                            stringBuilder.append("BULK USB_DIR_OUT index:").append(index);
                        }
                    } else if (point.getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {
                        if (point.getDirection() == UsbConstants.USB_DIR_IN) {
                            stringBuilder.append("INT USB_DIR_IN index:").append(index);
                        } else if (point.getDirection() == UsbConstants.USB_DIR_OUT) {
                            stringBuilder.append("INT USB_DIR_OUT index:").append(index);
                        }
                    }
                }
            }
        } catch (Exception e) {
            showToast("错误:" + e.getMessage());
        }
    }

    private String sendData(byte[] sendbuffer) {
        int timeOut = 500;
        String resultStr = "";
        try {
            for (int i = 0; i < mUsbInterfaceList.size(); i++) {
                UsbInterface mUsbInterface = mUsbInterfaceList.get(i);
                for (int index = 0; index < mUsbInterface.getEndpointCount(); index++) {
                    UsbEndpoint point = mUsbInterface.getEndpoint(index);
                    if (point.getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {
                        if (point.getDirection() == UsbConstants.USB_DIR_IN) {
                            byte[] receivebuffer0 = new byte[8];
                            int retIn = mUsbDeviceConnectionList.get(i).bulkTransfer(point, receivebuffer0, receivebuffer0.length, timeOut);
                            MyLog.e("receive ret: " + retIn + "  " + byte2HexString(receivebuffer0, receivebuffer0.length));
                            if (retIn > 0)
                                resultStr = new String(receivebuffer0);
                            MyLog.e("private key:" + resultStr);
                        } else if (point.getDirection() == UsbConstants.USB_DIR_OUT) {
                            int retOut = mUsbDeviceConnectionList.get(i).bulkTransfer(point, sendbuffer, sendbuffer.length, timeOut);
                            MyLog.e("send ret: " + retOut + "  " + byte2HexString(sendbuffer, sendbuffer.length));
                        }

                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultStr;
    }

    private String getData() {
        int timeOut = 500;
        String resultStr = "";
        try {
            for (int i = 0; i < mUsbInterfaceList.size(); i++) {
                UsbInterface mUsbInterface = mUsbInterfaceList.get(i);
                for (int index = 0; index < mUsbInterface.getEndpointCount(); index++) {
                    UsbEndpoint point = mUsbInterface.getEndpoint(index);
                    if (point.getType() == UsbConstants.USB_ENDPOINT_XFER_INT) {
                        if (point.getDirection() == UsbConstants.USB_DIR_IN) {
                            byte[] receivebuffer0 = new byte[8];
                            int retIn = mUsbDeviceConnectionList.get(i).bulkTransfer(point, receivebuffer0, receivebuffer0.length, timeOut);
                            MyLog.e("receive ret: " + retIn + "  " + byte2HexString(receivebuffer0, receivebuffer0.length));
                            if (retIn > 0)
                                resultStr = new String(receivebuffer0);
                            MyLog.e("resultStr:" + resultStr);
                        }
                    }
                }
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return resultStr;
    }

    private void connectDevice() {
        MyLog.e("mUsbManager:" + mUsbManager);
        if (mUsbManager == null)
            initUsbManager();
        HashMap<String, UsbDevice> deviceList = mUsbManager.getDeviceList();
        if (deviceList == null) {
            showToast("devices is null，please connect");
            return;
        }
        for (Map.Entry<String, UsbDevice> entry : deviceList.entrySet()) {
            UsbDevice mDevice = entry.getValue();
            this.mDevice = mDevice;
            stringBuilder.append("已授权:").append(mUsbManager.hasPermission(mDevice)).append("\n");
            if (mUsbManager.hasPermission(mDevice))
                initConnection();
            else {
                mUsbManager.requestPermission(this.mDevice, mPermissionIntent);//your code
            }
        }
    }

    private void showToast(String toastStr) {
        if (toastStr != null) {
            Toast.makeText(USBIoService.this, toastStr, Toast.LENGTH_SHORT).show();
            stringBuilder.append(toastStr).append("\n");
        }
    }

    @Override
    public boolean onUnbind(Intent intent) {
        releaseConnection();
        releaseBroadcastReceiver();
        return super.onUnbind(intent);
    }

    private void releaseConnection() {
        if (mIOThread != null) {
            mIOThread = null;
        }

        for (int i = 0; i < mDevice.getInterfaceCount(); i++) {
            UsbDeviceConnection mUsbDeviceConnection = mUsbDeviceConnectionList.get(i);
            UsbInterface mUsbInterface = mUsbInterfaceList.get(i);
            mUsbDeviceConnection.releaseInterface(mUsbInterface);
            mUsbDeviceConnection.close();
        }

        if (mDevice != null) {
            mDevice = null;
        }
    }

    private void releaseBroadcastReceiver() {
        unregisterReceiver(mUsbReceiver);
    }

    public static String byte2HexString(byte[] bytes, int len) {
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < len; i++) {
            int temp = bytes[i] & 0xff;
            String s = Integer.toHexString(temp);
            if (s.length() < 2) {
                s = '0' + s;
            } else {
                s = s;
            }
            if ((i + 1) % 8 == 0) {
                s = s + "\n";
            } else {
                s = s + "-";
            }
            str.append(s);
        }
        return str.toString();
    }

    public class MyBinder extends Binder {

        public void startTransferData() {
            connectDevice();
        }

        public String sendBufferData(byte[] data) {
            return sendData(data);
        }

        public String getReceiveKey() {
            return getData();
        }

        public String getLogStr() {
            String ret = stringBuilder.toString();
            stringBuilder = new StringBuilder();
            return ret;
        }
    }
}

USBIoUtils.class

package com.shanwan.usbdevice;

import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;

import java.util.Random;


public class USBIoUtils {

    private Activity activity;
    private static USBIoService.MyBinder mBinder;
    public final byte[] bytes = new byte[18];

    private final ServiceConnection mIOServiceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            mBinder = (USBIoService.MyBinder) service;
            mBinder.startTransferData();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            mBinder = null;
        }
    };

    public void startReceive(Activity activity) {
        this.activity = activity;
        final Intent intent = new Intent(activity, USBIoService.class);
        activity.bindService(intent, mIOServiceConnection, Service.BIND_AUTO_CREATE);
    }

    public void stopReceive() {
        activity.unbindService(mIOServiceConnection);
    }

    //length用户要求产生字符串的长度
    public String getRandomString(int length) {
        String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789";
        Random random = new Random();
        bytes[0] = 4;
        bytes[1] = (byte) random.nextInt(8);
        StringBuilder stringBuilder =new StringBuilder();
        for (int i = 0; i < length; i++) {
            int number = random.nextInt(62);
            bytes[i + 2] = (byte) str.charAt(number);
            stringBuilder.append(str.charAt(number));
        }
        return stringBuilder.toString();
    }

    public String send(byte[] bytes) {
        return mBinder.sendBufferData(bytes);
    }

    public String getIRK(){
       return mBinder.getReceiveKey();
    }

    public String getLog(){
       return mBinder.getLogStr();
    }
}